Sieve.



Patented luly 29, |902.

A. TEICHMANN.

SIEVE.

(Application filed Jline 10, 1901.)

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UNITED STATES PATENT OFFICE.

ALBERT TEICHMANN, OF FRSTENWALDE, GERMANY.

SII EVE.

SPCFICATIO forming part Of Letters Patent NO. 705,717, dated July 29, 1902.

Application filed June 10, 1901.

To aZZ whom, it may concern.-

Be it known that I, ALBERT TEICHM'ANN, a subject of the King of Prussia, Emperorof Germany, residing at Frstenwaldeon-the Spree, in the Kingdom of Prussia and Empire of Germany, have invented new and useful Improvements in Sieves, of which the following is a specification.

My invention relates to sieves for sifting, sorting, bolting, screening, and like apparatus.

Numerous attempts have heretofore been made to replace the silk gauze of sifting and like apparatus by other materials which are cheaper and more durable. Thus the `gauze was replaced by sifting-surfaces of Celluloid, and trials showthat this material forms a substitute which works Wellg but in practice the use of the same vfor sifting-machineswas checked by its inflammability, the point of ignition being 90 centigrade below that of the silk gauze usually employed. Wire-gauze, perforated plates, perforated skins, and the like were also found to be unsuitable in practice for various reasons.

The object of my invention is to provide a sieve for the above purposes which, first, is cheaper than any heretofore produced; secondly, more durable, safe, and almost fireproof, and, thirdly, more efficient, as will be further described.

In the accompanying drawings I have illustrated my improved sieve, in Which-' `Figure l is a section on the line A B of Fig. 2 and showing the frame to which the sieve is fastened, and Fig. 2 is a plan of the sieve.

Referring now to the drawings for a further description, bis a frame, of any suitable make and shape, to which the perforated sheet or sieve of vulcanized ber a is attached by nails c. The perforated sheet of vulcanized liber hasmany advantages` over the materials heretofore enumerated and for the purpose named. For instance, the vulcanized fiber is not affected by either hot or cold Water or other moist agents and in this respect lthe fiber compressed to great density,

Serial No.64,032. (No model.)

surpasses silk gauze and also the before-menA tioned substitutes which have heretofore been employed. Its point of ignition is far higher than that of silk gauze and particularly that of cellulod sieves.

The perforated sheet of vulcanized fiber is satined for the purpose of smoothing its rough surfaces to prevent the material which is to be sifted from adhering to the same and is then used like silk gauze. It is glued, nailed, or otherwise fastened upon the cylin drical or flat frame Z2. The satiniug, smoothing, or hot-pressing of the vulcanized fiber is accomplished by passing the sheet between highlypolished cylinders, which are heated, or by placing them between polished zinc plates'and subjecting them to high pressure,

so that the surfaces of the vulcanized fiber sheet are rendered smooth and glossy and his satining or hotl pressing of the vulcanized ber sheets gives them a certain temper, like spring-steel, so that whensuch sieves are used for sifting hour, die., by which the sieve is subjected to jerky or vibratory motion, the sheet willflrst follow `the downward direction and then react, so that a doun ble action of the sieve is acquired.

No material heretofore used for sieves of this kind has the properties of reacting in a degree obtained by the use of vulcanized liber, especially when it is satined or hotpressed. The manufacture of the sheets of vulcanized iiber is well known and does not form part of this invention; but,

Having thus described the nature-and object of my invention, what I claim as new, and desire to secure by Letters Patent, is-

A sieve for sifting and analogous machines, consisting of a hot=pressed perforated sheet of vulcanized ber, substantially as and for the purposes set forth.

ALBERT TEICHMANN. Witnesses:

HENRY HAsPER, WOLDEMAR HAUPT. 

